implement retry strategy for event hubs upload
implement retry strategy for event hubs upload

(cherry picked from commit 1345eb73a142a1afee81667a2e1a2bfcca32f146)

UIKit0/TouchDevelop,jle33/TouchDevelop,Aksoom-Hussain/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,UIKit0/TouchDevelop,jmptrader/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,MetSystem/TouchDevelop,UIKit0/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,CodeKingdomsTeam/TouchDevelop,Aksoom-Hussain/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,CodeKingdomsTeam/TouchDevelop,jle33/TouchDevelop,jmptrader/TouchDevelop,sedouard/TouchDevelop,CodeKingdomsTeam/TouchDevelop,ntoll/TouchDevelop,ntoll/TouchDevelop,Aksoom-Hussain/TouchDevelop,jle33/TouchDevelop,sedouard/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,jmptrader/TouchDevelop,jle33/TouchDevelop,CodeKingdomsTeam/TouchDevelop,MetSystem/TouchDevelop,jle33/TouchDevelop,jmptrader/TouchDevelop,ntoll/TouchDevelop,sedouard/TouchDevelop,MetSystem/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop